<form action="{{url()->current()}}">
    <div class="input-group">
        <input type="text" name="w" placeholder="请输入搜索关键词" class="form-control">
        <div class="input-group-append">
            <button type="submit" class="input-group-text bg-white">搜索</button>
        </div>
    </div>
</form>
